| 摘要 |
PROBLEM TO BE SOLVED: To provide a brake function while preventing a size increase and high cost of a transmission path including a pulley type transmission mechanism.SOLUTION: A brake structure includes: recessed or projecting engaged parts provided over the whole circumference of an outer peripheral edge of a pulley half body, radially opened outward or radially projecting outward; a brake operating arm provided freely to oscillate around an oscillation axis parallel with a rotation axis of the pulley half body; and an engaging part provided in the brake operating arm. The brake operating arm can be selectively positioned between the brake operating position, wherein the engaging part is engaged with any one of the engaged parts, and the brake releasing position, wherein the engaging part is removed from the plurality of engaged parts, around the oscillation axis in response to an external operation. |
